linux-kernel - [PATCH] x86: fix pte allocation in "x86: introduce init_memory

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Message-ID: <48616800.8030603@goop.org>
Date:	Tue, 24 Jun 2008 17:32:48 -0400
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Yinghai Lu <yhlu.kernel@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: fix pte allocation in "x86: introduce init_memory_mapping
 for 32bit"

The patch "x86: introduce init_memory_mapping for 32bit" does not allocate 
enough space for PTEs if the CPU does not implement PSE.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Cc: Yinghai Lu <yhlu.kernel@...il.com>
---
 arch/x86/mm/init_32.c |    5 +++++
 1 file changed, 5 insertions(+)

===================================================================
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -733,6 +733,11 @@
 	pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT;
 	tables += PAGE_ALIGN(pmds * sizeof(pmd_t));
 
+	if (!cpu_has_pse) {
+		int ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;
+		tables += PAGE_ALIGN(ptes * sizeof(pte_t));
+	}
+
 	/*
 	 * RED-PEN putting page tables only on node 0 could
 	 * cause a hotspot and fill up ZONE_DMA. The page tables


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